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The Effect of AlTi5B1 Masteralloy on Al-Si Alloy Casts Grain Size AlTi5B1母粒合金对Al-Si合金铸件晶粒尺寸的影响
Acta Mechanica Slovaca Pub Date : 2022-12-15 DOI: 10.21496/ams.2023.004
T. Vlach, Roman Horký
{"title":"The Effect of AlTi5B1 Masteralloy on Al-Si Alloy Casts Grain Size","authors":"T. Vlach, Roman Horký","doi":"10.21496/ams.2023.004","DOIUrl":"https://doi.org/10.21496/ams.2023.004","url":null,"abstract":": This article deals with the issue of silumin inoculation. Two alloys, AlSi7Mg0.3 and AlSi10.5Cu1.2Mn0.8Ni1.2, were selected. 4 pieces of castings were cast from each alloy. One casting was not inoculated and 3 castings were inoculated using AlTi5B1 prealloy in concentrations of 0.05 wt. %, 0.1 wt % and 0.2 wt. % Ti. The castings were cast into metal molds preheated to a temperature of 200°C ± 5°C. In total, 8 pieces of metallographic cuttings were prepared for each alloy. Four samples were taken from the bottom part of the casting and four samples from the middle part of the casting. Secondary axes of DAS dendrites were measured using a microscope. Subsequently, the microhardness of the solid solution α was measured according to Vickers.","PeriodicalId":135905,"journal":{"name":"Acta Mechanica Slovaca","volume":"235 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122392271","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Device for Failure Detection on Production Machines 生产机器故障检测装置
Acta Mechanica Slovaca Pub Date : 2022-12-15 DOI: 10.21496/ams.2023.009
Radka Jírová, L. Pešík, M. Sturm, Anett Maria Kupka
{"title":"Device for Failure Detection on Production Machines","authors":"Radka Jírová, L. Pešík, M. Sturm, Anett Maria Kupka","doi":"10.21496/ams.2023.009","DOIUrl":"https://doi.org/10.21496/ams.2023.009","url":null,"abstract":": Linear rolling systems are frequently used in industrial practice for the linear motion of machine parts or mechanical assemblies. Their reliability and prediction of possible failures are, during a production process, highly required to prevent production losses. Unfortunately, common diagnostic systems of linear rolling systems in industrial practice still fail in particular cases. Therefore, we designed an innovative solution for the diagnostic system based on a load-free part with a vibration sensor integrated into a carriage of the linear rolling system. A functional sample of diagnostics was produced, and vibrations measured on a loaded carriage and the diagnostic part in laboratory conditions were compared. Encouraging results were reached by time-domain analysis of measured data. On the diagnostic part, the damage appeared clearly, while on the loaded carriage, we did not observe any signs of damage.","PeriodicalId":135905,"journal":{"name":"Acta Mechanica Slovaca","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127531415","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Comparison of Dental Surgical Guides Created by Additive Manufacturing 用增材制造制造的牙科手术指南的比较
Acta Mechanica Slovaca Pub Date : 2022-12-15 DOI: 10.21496/ams.2022.015
Ľuboš Chromý, Viktória Rajťúková, Andrea Sinčák - Konečná, Svetlana Rusnáková, R. Hudák
{"title":"Comparison of Dental Surgical Guides Created by Additive Manufacturing","authors":"Ľuboš Chromý, Viktória Rajťúková, Andrea Sinčák - Konečná, Svetlana Rusnáková, R. Hudák","doi":"10.21496/ams.2022.015","DOIUrl":"https://doi.org/10.21496/ams.2022.015","url":null,"abstract":": The presented work deals with the analysis and testing of surgical guidance systems in the dental field, which were created based on available software. When manufacturing dental guidance systems, it is important to consider factors such as the digitization process in the production process, design, selection of the most suitable material and method of implantation. Three types of surgical guidance systems were made by three different devices which work on the principle of additive technology and were closely analysed. Subsequently, the created surgical guidance systems were compared with Standard Triangle Language (STL) files in Gom Inspect software, to determine the accuracy of printed objects. In conclusion, it is important to note that the presented work is a pilot study, which is focused on the design of a methodology to produce surgical guides using 3D printing, taking into account shape accuracy.","PeriodicalId":135905,"journal":{"name":"Acta Mechanica Slovaca","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114226142","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The Influence of the Annealing Method on the Properties of Twice Reduced Thin Steel Sheets 退火方法对二次还原薄钢板性能的影响
Acta Mechanica Slovaca Pub Date : 2022-09-15 DOI: 10.21496/ams.2022.016
J. Majerníková, Samuel Vilkovský, Július Hajduk
{"title":"The Influence of the Annealing Method on the Properties of Twice Reduced Thin Steel Sheets","authors":"J. Majerníková, Samuel Vilkovský, Július Hajduk","doi":"10.21496/ams.2022.016","DOIUrl":"https://doi.org/10.21496/ams.2022.016","url":null,"abstract":": Thin packaging steel sheet is currently used in the food industry, but it is also a frequently used material in other industries. Higher requirements for quality, reduction of energy and material intensity are the main factors that determine its development. The paper compares the test results of thin twice-reduced packaging sheets, which were produced by different annealing - continuous and batch method. Mechanical properties of these materials obtained by the uniaxial and biaxial tensile tests were compared. The anisotropic properties of thin steel sheets, which are demonstrated by the formation of ears on the cups, were evaluated by the deep-drawing cup test.","PeriodicalId":135905,"journal":{"name":"Acta Mechanica Slovaca","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130876035","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Numerical Simulation of Heat Transfer Behaviors in Conical Pin Fins Heat Sinks 锥形钉翅散热器传热特性的数值模拟
Acta Mechanica Slovaca Pub Date : 2022-09-15 DOI: 10.21496/ams.2023.002
Sayah Souida, Djamel Sahel, * 2, H. Ameur, A. Yousfi
{"title":"Numerical Simulation of Heat Transfer Behaviors in Conical Pin Fins Heat Sinks","authors":"Sayah Souida, Djamel Sahel, * 2, H. Ameur, A. Yousfi","doi":"10.21496/ams.2023.002","DOIUrl":"https://doi.org/10.21496/ams.2023.002","url":null,"abstract":": The present study is a numerical investigation of the effect of the shape of pin fins on the overall performances of heat sinks. Conical shaped pin fins with varying conical size ratio ( Hcp/d ) are considered. Five geometrical cases are explored, namely Hcp/d = 0.167, 0.333, 0.500, 0.667 and 0.833. The distribution and values of temperature, Nusselt number, thermal resistance, pressure drop, as well as the hydrothermal performance factor are determined for various Reynolds numbers (up to 8,000). In addition, the performances of conical shaped fins are compared to those of the cylindrical fins. The obtained results revealed a decrease in the thermal resistance with increasing Re and Hcp/d ratio. At Re = 8000 and when changing ( Hcp/d ) from 0.167 to 0.833, the thermal resistance is decreased from 192.30% to 83.52% compared to the cylindrical pin fins. However, the increased ( Hcp/d ) ratio yields an increase in the pressure drop. At Re = 8000, the values of pressure drop for the conical fins are lower than those of the cylindrical fins by 343.32%, 275.92%, 205.79%, 144.86% and 100.38% for Hcp/d = 0.167, 0.333, 0.500, 0.667 and 0.833, respectively. The values of the hydrothermal performance factor ( h ) for the conical fins are greater than those of the cylindrical fins. Also, an increase in ( h ) values is observed with decreasing Hcp/d ratio. The highest ( h ) value of 1.51 is reached with the case Hcp/d = 0.167 at Re = 8,000.","PeriodicalId":135905,"journal":{"name":"Acta Mechanica Slovaca","volume":"126 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121035436","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Evaluation of Topological Modification on Gear Wheel Bodies 齿轮轮体拓扑变形的评价
Acta Mechanica Slovaca Pub Date : 2022-09-15 DOI: 10.21496/ams.2022.013
S. Sivák, S. Maláková
{"title":"Evaluation of Topological Modification on Gear Wheel Bodies","authors":"S. Sivák, S. Maláková","doi":"10.21496/ams.2022.013","DOIUrl":"https://doi.org/10.21496/ams.2022.013","url":null,"abstract":": Paper was devoted to introduction of various methods regarding the possibilities of optimization of gear wheel body shape. Evaluation was done by a finite element analysis, which gave a deformation results of a gearing, and also by comparison of weight loss. This optimization was performed by modeling 5 models of gear wheel bodies of which, one was reference one and other four had relieve elements modeled. Each model was compared to the reference one in first step by weight loss and deformation values. In the second step the analysis was conducted taking into account both evaluations, which result was a choice of best variant.","PeriodicalId":135905,"journal":{"name":"Acta Mechanica Slovaca","volume":"118 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131507992","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Numerical Simulation of Ammonia-Water Solution Based Heat Absorber 氨-水溶液型吸热器的数值模拟
Acta Mechanica Slovaca Pub Date : 2022-09-15 DOI: 10.21496/ams.2023.006
Michal Volf, M. Jeřábek, M. Demianenko
{"title":"Numerical Simulation of Ammonia-Water Solution Based Heat Absorber","authors":"Michal Volf, M. Jeřábek, M. Demianenko","doi":"10.21496/ams.2023.006","DOIUrl":"https://doi.org/10.21496/ams.2023.006","url":null,"abstract":": This article provides an insight into the numerical simulation of an ammonia-water solution-based plate heat absorber, which is a crucial part of an absorption chiller. These chillers could be used as part of a stratified chilled-water storage tank configuration for coupling to a small modular reactor. The common approach utilized in the process of designing the chiller is to call the absorber a “black box” without considering the processes inside. It follows that the resulting design must be highly oversized to ensure reliable operation of the system. This article focuses on the obstacles that needs to be overcome in order to simulate the processes inside the absorber, such as stream breakup into separate droplets or absorption of ammonia. Unfortunately, we do not have any experimental data we could use to validate our simulations and thus this article should be looked at as a “proof of concept” and a possible guideline for simulations of similar phenomenon.","PeriodicalId":135905,"journal":{"name":"Acta Mechanica Slovaca","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131649827","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The Level of Sustainability and Digitalization of Small and Medium-sized Enterprises in Slovakia 斯洛伐克中小企业的可持续性和数字化水平
Acta Mechanica Slovaca Pub Date : 2022-09-15 DOI: 10.21496/ams.2022.011
Laura Lachvajderová, J. Kádárová
{"title":"The Level of Sustainability and Digitalization of Small and Medium-sized Enterprises in Slovakia","authors":"Laura Lachvajderová, J. Kádárová","doi":"10.21496/ams.2022.011","DOIUrl":"https://doi.org/10.21496/ams.2022.011","url":null,"abstract":": The article focuses on small and medium-sized enterprises (SMEs), their barriers and successes, associated with the transition to a sustainable and digital economy before the COVID-19 pandemic. Emphasis is placed on comparing the level and identifying differences in the transition to digitalization and sustainability of SMEs in Slovakia with the Europe Union's (EU) average. The comparison of the level of SMEs in Slovakia and the EU average is focused on the barriers associated with the introduction of digitalization; approaches applied in the adoption of digital technologies; already applied types of digital technologies; measures taken in relation to environmental and social sustainability; the existence of a strategy to support becoming a sustainable business and barriers to sustainability. Based on the input data, which are drawn from a survey published by Flash Eurobarometer 486 (FL486), interesting findings and contrasts were reached between SMEs in Slovakia and the EU average.","PeriodicalId":135905,"journal":{"name":"Acta Mechanica Slovaca","volume":"129 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121194141","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Plates and Jaw Stress-Strain State in Case of a Lower Jaw Angular Fracture 下颌骨角状骨折的板与颚应力-应变状态
Acta Mechanica Slovaca Pub Date : 2022-09-15 DOI: 10.21496/ams.2023.005
Y. Kuzenko, Maksym Skydanenko, O. Kuzenko, D. Zhyhylii, O. Ivchenko, Bohdan Denysenko
{"title":"Plates and Jaw Stress-Strain State in Case of a Lower Jaw Angular Fracture","authors":"Y. Kuzenko, Maksym Skydanenko, O. Kuzenko, D. Zhyhylii, O. Ivchenko, Bohdan Denysenko","doi":"10.21496/ams.2023.005","DOIUrl":"https://doi.org/10.21496/ams.2023.005","url":null,"abstract":": One of the most pressing issues of maxillofacial surgery is the traumatism of the facial bones. At present, titanium plates with screw joints are the commonest for fixing jaw fragments in maxillofacial surgery. The cause of complications in osteosynthesis with titanium is the force generated by the masticatory muscles, transmitted through the plate and jaw fragments, and causing looseness of the screw joints. Moreover, plate fractures are caused by material fatigue due to plate bending occurring under surgery. The purpose of this paper is to compare the plate designs according to the maximum stresses arising under the action of masticatory loads and to check the fixation reliability with the subsequent plate development of a reduced bone-plate contact area. Ansys Workbench software package, namely the Transient Structural module, is used for calculations based on the finite element method to study the stress-strain state of the lower jaw after titanium osteosynthesis. Plates' designs for osteosynthesis metal are developed considering the strength of the masticatory muscles. The maximum stresses in the plates have been determined, which are 481 MPa for a straight plate, 487 MPa for a y-shaped plate, and 301 MPa for a square plate. Following the mentioned, these stresses do not exceed the yield strength of titanium grade ВТ1, the smallest of them occurring in a square-shaped plate. The maximum gap has been also determined, between fragments it is 0.75 mm for a straight plate, 0.15 mm for a y-shaped plate, and 0.13 mm for a square plate. Therefore, the square plate provides the most reliable fixation of jaw fragments.","PeriodicalId":135905,"journal":{"name":"Acta Mechanica Slovaca","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134130474","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Mathematical Simulation of Pulverized Coal Combustion 煤粉燃烧的数学模拟
Acta Mechanica Slovaca Pub Date : 2022-09-15 DOI: 10.21496/ams.2023.008
Yesudass Arasappan
{"title":"Mathematical Simulation of Pulverized Coal Combustion","authors":"Yesudass Arasappan","doi":"10.21496/ams.2023.008","DOIUrl":"https://doi.org/10.21496/ams.2023.008","url":null,"abstract":": Two different computational fluid dynamic models for the combustion of species were applied for the study of the combustion of pulverized coal in a drop tube. The drop tube is available in the department of energy research of the technical university of Ostrava. The purpose of this work is to find out the main characteristics of the combustion of pulverized coal using data gathered at the laboratory where the drop tube is installed. Some characteristics studied were the total heat transfer involved in the combustion, highest temperature and pressure gradients. A 2d mesh of the drop tube was created in gambit pre-processor and the simulations were performed using the CFD program Ansys fluent. The simulations were performed with double precision (dp mode) in order to get accurate results. In order to simulate the pulverized coal combustion, it was necessary to study turbulence, turbulence models (RNG k− e ), combustion models (species transport and non-premixed model) as the modeling in gambit and the setting up of a case in Ansys Fluent. The main goal was to get similar results in the simulations using distinct approaches (different methods of studying the combustion) in Ansys Fluent and the results were satisfying. The total amount of heat transfer results, for example, was quite similar in both experiences.","PeriodicalId":135905,"journal":{"name":"Acta Mechanica Slovaca","volume":"74 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121464088","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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